The League has reached the ignition point of the quantum storms that has been destroying the Microverse.
JLA #15 is a good, solid story with good solid art to back it up and really sets up the next chapter really well.
Being King's first arc, this feels like a solid beginning to his run, with his slow burn storytelling we really are just getting into the meat of it. Bringing in the JLA to a Batman comic is always a tricky proposal, yet King manages to do it with grace, using them to show how powerful this foe truly is. Ultimately it was not the JLA or even Batman that defeats Gotham, instead of something more astute.